/*
 * [New BSD License]
 * Copyright (c) 2011-2012, Brackit Project Team <info@brackit.org>  
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the Brackit Project Team nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.brackit.xquery.atomic;

import org.brackit.xquery.ErrorCode;
import org.brackit.xquery.QueryException;

/**
 * 
 * @author Sebastian Baechle
 * 
 */
public abstract class AbstractDuration extends AbstractAtomic implements
		Duration {
	@Override
	public int hashCode() {
		throw new RuntimeException("Not implemented yet");
	}

	@Override
	public int cmp(Atomic atomic) throws QueryException {
		throw new QueryException(ErrorCode.ERR_TYPE_INAPPROPRIATE_TYPE,
				"Cannot compare '%s with '%s'", type(), atomic.type());
	}

	@Override
	public final boolean eq(Atomic atomic) throws QueryException {
		if (atomic instanceof Duration) {
			Duration other = (Duration) atomic;
			return ((isNegative() == other.isNegative())
					&& (getYears() == other.getYears())
					&& (getMonths() == other.getMonths())
					&& (getDays() == other.getDays())
					&& (getHours() == other.getHours())
					&& (getMinutes() == other.getMinutes()) && (getMicros() == other
					.getMicros()));
		}
		throw new QueryException(ErrorCode.ERR_TYPE_INAPPROPRIATE_TYPE,
				"Cannot compare '%s with '%s'", type(), atomic.type());
	}

	protected abstract boolean zeroMonthsWhenZero();

	@Override
	public final String stringValue() {
		boolean fieldSet = false;
		boolean timeSet = false;
		StringBuilder out = (!isNegative()) ? new StringBuilder("P")
				: new StringBuilder("-P");
		short years = getYears();
		byte months = getMonths();
		short days = getDays();
		byte hours = getHours();
		byte minutes = getMinutes();
		int micros = getMicros();

		if (years != 0) {
			out.append(years);
			out.append('Y');
			fieldSet = true;
		}
		if (months != 0) {
			out.append(months);
			out.append('M');
			fieldSet = true;
		}
		if (days != 0) {
			out.append(days);
			out.append('D');
			fieldSet = true;
		}
		if (hours != 0) {
			if (!timeSet) {
				out.append('T');
				timeSet = true;
			}
			out.append(hours);
			out.append('H');
			fieldSet = true;
		}
		if (minutes != 0) {
			if (!timeSet) {
				out.append('T');
				timeSet = true;
			}
			out.append(minutes);
			out.append('M');
			fieldSet = true;
		}
		if (micros != 0) {
			if (!timeSet) {
				out.append('T');
				timeSet = true;
			}
			int seconds = micros / 1000000;
			out.append(seconds);
			int remainder = (micros - (seconds * 1000000));
			if (remainder != 0) {
				out.append('.');
				out.append(remainder);
			}
			out.append('S');
			fieldSet = true;
		}
		if (!fieldSet) {
			out.append(zeroMonthsWhenZero() ? "0M" : "T0S");
		}

		return out.toString();
	}

	@Override
	public final boolean booleanValue() throws QueryException {
		throw new QueryException(ErrorCode.ERR_INVALID_ARGUMENT_TYPE,
				"Effective boolean value of duration is undefined.");
	}
}
